Emtool is an image processing program for display and manipulation of electron
micrographs. It can read/write a variety of image formats, such as MRC, IMAGIC, GIF,
TIFF, etc... It has a very fast radix-17 FFT routine and can perform filtering, masking,
boxing and many other operations. It's primary advantage over programs like boxmrc
and imagic is that it is much more interactive and easier to use. It does not do 3d
reconstructions, but rather specializes in 2d image manipulation.